Ignition device of internal-combustion engines



Dec. 13, 1927. 1,652,328 F. H. ROYCE IGNITION DEVICE 0F INTERI AL COMBUSTION ENGINES Filed Oct. 27, 1925 Z'Sheets-Sheet 1 a7 a. I 6 h as? I c6 J'" I 5 1* '5 4 e a e F; H. ROYCE IGNITION DEVICE OF INTERNAL COMBUSTION ENGINES Dec. 13,1927.

27, 1925 2 Sheets-8heot 2 Filed Oct ar/11 v V Q'A.

, Patented Dec. 13, 1927. j

UNITED-STATES PAT O FI FREDERICK HENRY noyonvonwnsr wrrrnnme', unes. oHIonEsrER, E eIiAnnna SIGNOR TO ROL S-Boron LIMITED, or-nEnBY, ENGLAND.

IGNITION nnvrcn riv'rnnivAr comnns'rIon ENGINES.

Application filed October 27, 19:53 m no. 65,2601," and in Great Britain N-oveinber 19, 1924*.

This invention relates to a centrifugal deternal combustion engine and is an improvement on or modification of my 111V8I1t10flf01 which a British patent has been granted to me dated the 16th day of February,1922 and numbered 198,014. This invention is useful where in lieu of the member tof'be movedby the centrifugal device being a shaft coaxial with the rotating shaft which carries the centrifugal device asin the originalpatent, the member to be moved is a sleeve sliding axially onthe said rotating shaft. 'The invention a-pplie's'to constructionsin wh'ichthe centrifugal device isfsupported on two opposite trunnions extendedfrom a rotating shaft, and consists of four weightsthe centres of gravityof which stand in relation to one another-as the corners of a square or rectangle, the pairs of weights in diagonal relationship being rigidly secured together, and all the weights swinging about F a centre with a spring or "springs reacting between each pair ofweights' torsionally and not otherwise. i T i The object of this invention is to" improve the sensitiveness of such type" of apparatus and, to that end, to effect improvements in the method of mounting and adjustin the springs reaacting between the centri ugal Weights, consisting in arranging two sleeves, one superimposed on the other, mounted on each of the trunnions"respectivelyrigidly. attachedflto the bars carrying there'spective 'pairs of weightsand a coil'spring'windin'g eachpair of sleeves,.having a torsional ten:

by means of bolts d passing through perforationsvin the 'barsfandfweights and en-, 95 ther secured in the desired position by tongues 03 formed on the arms and engaging I sionthereon', one end of which is securedto a bar carrying two of'th'e weights, or the weights, or the sleeve rigid therewith,*and

further consisting of improved transmission from the centrifugal Weight to the lever lop eratively connected to the advance and re tard device.

- An example of my-invention is illustrated v and located axially on the sleeve eiby the in the accompanyingdrawings;

centrifugal device.

: a is the case supporting thecentrifugal apparatus having a flange a which rests on the flange a of the engine crankcase, to

I land 55 and 'Fig. 4 is a side view of the vice forrautomatically adjusting the advance I i and retard device of the ignition'in an in which it is secured by means'of perforated.

bosses'a and bolts a4. a and a are covers secured to the case a anda is a sleeve with an extended skirt secured to the shaft hereinafterreferred to," th'e"co:vers a a, and

sleeve a being shaped to form-an oil seal or trap. a is a threaded nut, engaging a threaded eXte'nsiOna -of the casewholding in" position the outer rac'eof the ball bearings hereinafter referred to. b isthe shaft carrylng the centrifugal Weights rotatingjin ball bearingsb 6 is a conical sleeve,

lwhich with a'shoulder formed on: the shaft, locates axially the inner race of the said ball bearings and is fixed for rotation to the shaft b. b is asleeve carrying the pinion b (bymeans of whic-h the shaft is driven) fixed for rotation'with sleeve 6 having a recess 5 formed at the'end' thereof', and secured to the shaft by the washer 6 and nut' 6 b is a washer to determine-the axial location of the assembly. {0' is a sleeve pinned to the shaft 6 and hasfo'rined on it trunnions 0 and '0 which constitute the spindles'oraxles' of'the centrifugal device. d and d are two bars mounted on the trimnion 0 having'relation to one another as the lines of the letter X, and d and (Z are corresponding bars mounted on the other trunnion'c inlike manner: 0Z areweights of the centrifugal jdevice locatedbetween the bars d and c1 onthe' oneside and cl? and (Z on the other side, and secured thereto gaged by the nuts d The weightsare furwashers held apart by the-spacer sleeve .6

onfthe end of" the sleeve p Betweenthe her 6 formed' with'lugs e with" holes 6 shoulder e and a nut e engaging a thread washers is'freely mounted an annulaririemslidable axially on the shaft, and e? are two drilled therein, e are lugs formed on the I sleevee for the purposes hereinafter appearing. f a lever formed with a boss f rocking on a spindle f. f are jaws embracing the annular member 6 with a round hole therein to fic-onthe end of the'l'ever 'f t'o which it is secured by set'screw f passing through a perforationin the jaws and lever, and engaging a thread in the farther side of jaws, the j awypiece being split at that point, in the'plane of the paper on Fig. 2. The jaws are formed with threaded eyes which register with the holes 6 and are located on the lugs e by set screws i which are secured from rotation by a tab washer f. g. are four links secured at the lower end to lugs d and located in relation to one another by the sleeve g formed with shoulders g and the .h by means now to be described.

ends of which pass through perforations in the links and are riveted over on the outside. The sleeves and links are located in relation to, and are secured to, the bars by means of a shouldered bolt 9 and the shouldered dis tance sleeve 9*, the ends of the bolt and of the sleeve g" being. passed through perforations in the bars and riveted over on the outside. The saidlinks at the upper end are secured to lugse by rivets g passing through perforations in the said links and lugs and riveted over on the outside. it and 71, 311 flanged bushings mounted on the trunnions c and o and resting against shoulders formed on the sleeves c with extensions 71, and [L which are threaded at the ends for the purpose hereinafter described. h and 72/ are flanged bushes mounted respectively on the bushes k and he. The bar (I is mounted on the bush h and is secured thereto from rotation. The bar d is likewise mounted on and secured to the bush it and bar is likewise mounted on and secured to hush 71F, and the bar (5 is likewise mounted on'and secured to bush k, b are two spiral springs respectively secured at one end to the bars (Z and [F and se cured atthe other ends to the bushes h and h are collars each carrying a pin or hook. k to which the end of one of the springs is Socured, the said collars respectively reston a shoulder of the bushes izand 71 are washers secured from rotation on the said bushes, and h are nuts engaging the threads at the end of the bushes. The springs have no axial tension but. only a torsional tension and that to the degree required. The adjustment of the torsional tension of ea h spring is brought about by rotating the collar which carries with it one end of the spring until the desired tension is attained, and thenscrewing up the nut thus. causing the nonrot'atable washer to impinge onthe collar and clamp the same against the shoulder upon which it rests. a

l Vith apparatus as dewribed the centrifugal device is perfectly balanced and is practically free from all reactions or forces tending to load the bearings off the moving P i \Vhatlclaim is: I p

- 1'. Appamt usfto automatically adinst'the advance and retard device'of an internal combustion engine comprising a centrifugal device attached to and rotating with a shaft driven by the engine, consisting of four centrifugal weights, of which the respective centres of gravity stand in relation to one another. as the corners of a square or rectangle, the pair of weights diagonally o positevbeing respectively connected or bed by two bars or arms, the two bars connecting two elements or weights necessarily crossing the bars connecting the other two the two bars of each pair being respectively supported and rocking on two oppositel placed 'trunnions projecting from the sha t at right angles thereto; a sleeve slidabh-en said shaft means including links pivotally hinged to such bars and to the sleeve whereby the movement of the weights causes an axial movement of the sleeve on the shaft, a spark control lever pivoted intermediate its ends and having one of said ends pivotally and slida'hly connected to said sleeve; and an elastic device comprising a sleeve mounted on each of the trunnions to which the inner bars are respectively rig-idly secured, a sleeve mounted on each of the said sleeves to which the outer bars are respectively rigidly secured the inner sleeves extending be end the outer sleeves, coil springs with torsional tension therein embracing each of the outer sleeves fixed at one end to the outer bar or a member rigid therewith and fixed" at the other end to the inner sleeve.

2.'Apparatus to automatically adjust the advance and retard device of an internal combustion engine comprising a centrifugal device attached to and rotating with a shaft driven by thev engine, mnsisting of four centrifugal weights, of which the respective centres'of gravitystand in relation to one another asjthecorners of a square or rectangle, the pairs of weights diagonally posite being respectively connected or he d by two bars, the two bars connecting two elements or weights necemrily crossing the barsconnecting' "the other two, the two bars of each pair being respectively supported and rocking on two oppositely placed trunnions projecting from the shaft 'at. right angles thereto means including links pivotally hinged to such bars and to the sleeve whereby the movement of the weights causesnn axial movement of a slidable sleeve mount- ,ed on the Shaina spark control leverpivoted intermediate its ends and having oneof soid ends ,pivotally and slidably connected to said sleeve, and an. elastic q-ds vioe comprising a sleeve mounted on each of the trunnions ill] to which the inner bars are respectively rigidly secured, a sleeve mounted on each of the said sleeves to which the outer bars are respectively rigidly secured, the inner sleeves extending beyond the outer sleeves and having threaded ends, a collar freely mounted on the ends of each of the inner sleves and seating against a shoulder formed tension therein embracing each of the outer. sleeves secured at one end to the outer bar a or a member rigid therewith and at the. other end to the said collar, and nuts en-' gaging the-threads on' the inner sleeves 1 whereby on loosening the nut the collar can be'rotated to adjust the tension of the spring and on screwing up the nut the adjustment is retained.

3. Apparatus as claime d in claim N0, 1

- the means'conipr'ising two links respectively pivotally hinged to twolugs on opposite sides of the sliding sleeve and to the'bars,

ofthe centrifugal device.

4. Apparatus as'claimed in claim No.1

the means comprising two links, respectively hinged at one end on pivots or bolts traversing tl1B -pa.1lS otbars of thecentritugal U device and centrally located thereon by a shouldered bolt or pivot and by riveted dis tance pieces, and at the other end secured to two lugs on the sliding sleeve by rivets substantially as described.

5, Appparatus as claimed in claim No. 1

the sliding sleeve being geared to one of the arms of said spark control by means of a flange formed on such sleeve, two washers with a cylindrical distance piece of smaller diameter between them (thus forming an I annular channel between them) fitted and threaded on the sleeve, and located at one cndbythe flange and atthe other end by a nut'engaging a thread on the slee'eve, an

annular member loosely mounted'between such washers with a clearance between it and the cylindrical distance piece and hav 111g two opposite trunnions extended therefrom, and the arms of the said lever being in the form of aws, embracing the annular member and hinged to the trunnion.

6. Apparatus as claimed in claim No, 1

the sliding sleeve'being geared to one of the arms of said lever, 'by means of. a flangeformed on such sleeve, two washers withfa;

cylindrical distance pie'ce of smaller diam-' eter between them (thus forming an annular channel between them) fitted and threaded on the sleeve-and located. atone endfby the flange and at the other end by a nut ers with a clearancebetween it and the cylindrical distance piece and having two oppositetrunmons extended therefrom, and the arms of the said leverbeing inthe form of ed the trunnions having holes drilled axially, andset screws partially threaded, the threaded part engaging the said eyes and the otherpart engaging the said holes.

In Witness whereof Ihave signed this specification.

. FREDERICK HENRY ROYCE.

engaging athread on the sleeve, an annular member loosely mounted between such washjaws, embracing the annular member the jaws terminating 1n eyes internally thread- 

